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Aluminum alloy melting covering agent

A covering agent and aluminum alloy technology, which is applied in the field of aluminum smelting, can solve the problems of reducing aluminum conductivity, poor boron deoxidation effect, magnesium inclusions, etc., achieves strong chemical stability and thermal stability, ensures composition and performance, and promotes flotation flow effect

Inactive Publication Date: 2015-09-16
杨高林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for removing hydrogen during refining of aluminum and aluminum alloys include inert gas dehydrogenation, oxidation dehydrogenation and flux dehydrogenation, etc., but there are problems such as high cost and low efficiency of dehydrogenation equipment
Common deoxidation methods include phosphorus, lithium, boron, magnesium, etc., and the presence of phosphorus during deoxidation will strongly reduce the conductivity of aluminum. Lithium is expensive and easy to re-absorb hydrogen from the melt. Boron deoxidation effect is poor, and magnesium causes inclusions. Dehydrogenation and deoxidation refining technologies for the above-mentioned aluminum are difficult to meet the requirements of high-quality aluminum and aluminum alloy products

Method used

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  • Aluminum alloy melting covering agent

Examples

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Effect test

Embodiment 1

[0016] The aluminum alloy smelting covering agent in this embodiment is composed of the following components in parts by mass: 8 parts of boron carbide, 5 parts of silica sand, 12 parts of nano ceramics, 12 parts of aluminum oxide, 15 parts of chaff ash, modified 10 parts of perlite and 8 parts of wollastonite.

[0017] The above-mentioned covering agent for aluminum alloy melting comprises the following preparation steps:

[0018] (1) soak the wollastonite and aluminum oxide of the above weight parts with 8% sulfuric acid for 8 hours, wash with deionized water, then soak with 12% sodium hydroxide solution for 5 hours, then wash with deionized water until neutral , and then calcined at 550°C for 2 hours, and broken into fragments with a particle size of 1-3mm;

[0019] (2) Add the boron carbide, silica sand, and nano-ceramics of the above-mentioned parts by mass into 1.2g / L potassium permanganate solution for soaking, remove impurities, then filter and wash to be neutral, cal...

Embodiment 2

[0024] The aluminum alloy smelting covering agent in this embodiment is composed of the following components in parts by mass: 16 parts of boron carbide, 10 parts of silica sand, 25 parts of nano ceramics, 20 parts of aluminum oxide, 26 parts of chaff ash, modified 30 parts of perlite and 20 parts of wollastonite.

[0025] The above-mentioned covering agent for aluminum alloy melting comprises the following preparation steps:

[0026] (1) soak the wollastonite and aluminum oxide of the above weight parts with 12% sulfuric acid for 5 hours, wash with deionized water, then soak with 10% sodium hydroxide solution for 8 hours, then wash with deionized water until neutral , and then calcined at 800°C for 2 hours, and broken into fragments with a particle size of 1-3mm;

[0027] (2) Add the boron carbide, silica sand, and nano-ceramics of the above-mentioned parts by mass into 1.2g / L potassium permanganate solution for soaking, remove impurities, then filter and wash to be neutral,...

Embodiment 3

[0032] The aluminum alloy smelting covering agent in this embodiment is composed of the following components in parts by mass: 12 parts of boron carbide, 8 parts of silica sand, 18 parts of nano ceramics, 16 parts of aluminum oxide, 20 parts of chaff ash, modified 20 parts of perlite and 14 parts of wollastonite.

[0033] The above-mentioned covering agent for aluminum alloy melting comprises the following preparation steps:

[0034] (1) soak the wollastonite and aluminum oxide of the above weight parts with 10% sulfuric acid for 6 hours, wash with deionized water, then soak with 11% sodium hydroxide solution for 7 hours, then wash with deionized water until neutral , and then calcined at 700°C for 2 hours, and broken into fragments with a particle size of 1-3mm;

[0035] (2) Add the boron carbide, silica sand, and nano-ceramics in the above mass fractions into 1.2g / L potassium permanganate solution for soaking to remove impurities, then filter and wash to neutral, and calcin...

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Abstract

The invention relates to an aluminum alloy melting covering agent consisting of the following components: 8-16 parts by weight of boron carbide, 5-10 parts by weight of silica sand, 12-25 parts by weight of nanometer ceramic, 12-20 parts by weight of aluminum oxide, 15-26 parts by weight of rice husk ash, 10-30 parts by weight of modified expanded perlite, and 8-20 parts by weight of wollastonite. The melting covering agent is integrated with multiple functions such as deoxygenation, deaeration, and edulcoration; and the melting covering agent is of substantially strong adsorption, dissolution and chemical combination slagging abilities. The melting covering agent can restore the oxide inclusion in the molten aluminum alloy; and the melting covering agent can also remove hydrogen, oxygen and metal oxide adhered on the melting covering agent. The large surface tension between the melting covering agent and the melt can accelerate the flotation and flow of the slag, thereby allowing the slag to be separated from the molten aluminum better, and accordingly achieving the effects of refining and eliminating impurities as well as purifying the melt. The melting covering agent is of substantially strong chemical stability and thermal stability, without causing corrosion to the molten aluminum and the furnace lining, thereby ensuring the original components and the performance of the alloy.

Description

technical field [0001] The invention relates to an aluminum alloy smelting covering agent, which belongs to the technical field of aluminum smelting. Background technique [0002] Aluminum and aluminum alloys often contain impurity elements such as hydrogen, oxygen, sulfur, lead, bismuth, and arsenic in the smelting process. These impurity elements have a great influence on the thermal conductivity and processing performance of aluminum. For example, oxygen and sulfur are likely to cause "cold brittleness" of castings, lead and bismuth are likely to cause "hot brittleness" of materials, and hydrogen is the most common and most harmful gas in aluminum, which will cause a large number of pipes to foam and cause serious quality accidents. Adding an appropriate amount of smelting covering agent in the smelting process of aluminum and aluminum alloy can play the role of degassing, slag removal and grain refinement. [0003] At present, the methods for removing hydrogen during re...

Claims

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Application Information

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IPC IPC(8): C22C1/06
Inventor 杨高林
Owner 杨高林
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